Combined electric protection and warp stop for looms



Feb. 19, 1952 R. F. DION 2,586,311

COMBINED ELECTRIC PROTECTION AND WARP STOP FOR LOOMS Filed April 5, 1950 INVENTOR RAYMOND F. mow

ATTORNEY.

Patented Feb. 19, 1952 UNITED STATES T COMBINED EIiECTRIC PROTECTION AND WARP- STOP FOB- LOOMS- m nd? i ion, .Le t i ils s er 1 Crompton & Knowles LfiomWo'ijk's, Worcester,

Mass, a corporationof Massachusetts Application-April'3, 195.0,;SerialNo. 153,687

This invention relates to looms utilizing ,electric protection and electric warp stop motions :and it is the general object of the invention to interconnect the-circuits for the protection and the warp stop motion in such manner that-alsingle solenoid can be controlled to eiTect stopping ofv the loom when a shuttle is running -slow-or atdrop wire falls.

A type of electric protection which has been proposed heretofore utilizes a continuously energized electro-magnetic device undercontrol of two parallel circuits, one or the other of which is always closed so long as the shuttle is running on time. In this type of electric protection the timer switch opens at a time in the cycle of the loom when the shuttle if running on-time-reaches a given-point along the length of the layibetween the shuttle boxes, and a second switch located at said point is closed by the shuttle so that current is temporarily shunted from the timer switch through the shuttleoperated switch to maintain the electro-magnetic device in astateof constant energization. If, however, the shuttleshould be late it fails to close its switch when the timer switch is open and the solenoid or relay becomes deenergized to effect prompt loom stoppage.

with a solenoid which-is deenergized and upon falling of a drop wirenacircuit iscompleted through the solenoid to lift a link or its equivalent into the path of a knock ofi lever. The electric protection therefore requires acontinuously energized solenoid or relay as a conditionof continued loom operation, whereas the' -u'sual electric Warp stop motion employs va-normally open circuit. It is an important object-of the-present parts hereinafter described andset forth.

In the accompanying drawings, wherein a convenient embodiment of the invention is set forth,

Fig. 1 is a side elevation of part of aloo'inhaving theinventionapplied 'thereto, an'd 9 Claims, (01. 139-341) Electric warp stop motions :ordinarily operate Fig. 2 i s a diagram showing thefelectriccircu its utilized with the invention.

Referringmore particularly to Fig 1, the loom frame supports top'and bottom shafts; and 3 the former of which turns once for" eacn ea of the loom while thelatter shaft turns oric e every other beat of the loom. The loom ha" a lay 4 driven from the top shaft 2 by connectors oneipr which ,isfs'ho'wn at 5. The'iis'u'al 'wafpifihrad tern W iscontrolled by harness mechanisms indicated generally at 6' which'diyides' thethreads into top and bottom wail ShdsWl and W2, rewe ver, o. he t p ft will. or na ly m nthe d rection of arrowa, Fig, 1, to cause the layto reciprocate bac war y and .fQrWar IaamiW m t el ey i on, itsj baq wa d st oke theshi tt e wflleenera ly=. e-p .c ed-a d be inilish a ross herlqo hroil l here ainder o h bac wa do tmk of; th l a d-f a a t h en u forwa ok -a. v

The loom has shipper mechanism ds iifinated generally at H] controlling v loom .operation by ec anism not shown ere nz u W ll un ersto A' shipper or brake handle Il is connected toa rod 12 extending rearwardly and pivoted to the upper end of a lever -I 3 pivoted as at I 4 to a knockoff mechanismdesignated generally at I5.v A solenoid l6 is-held in fixed position on the mechnis 5;and hasa-;co e l1 con ec ed-toe knoc off l nk, I8. 1 re u r y ocki knock-01 i ye I9is upp tedlo a pi t car edbyi hc mecha i m. 5 ncla aused to o kp za or insi trok in a counter-clockwise directionas viewed m, Fi n e for each ickptme o m-,1. h s rockin is e ct by a cam av n opoo i elyexiendns, i er, oint for eng ent i h ana 1e .e 9- hepari es op rti ne h t-i 'l nk !8 hou d QW1li F h athzo lei I9 the a e asa wo n tr ke o c llb ns ed h ugh th rod|2 to he lqoin controllin or shippermechanism l llto move-the latterto loomstopping position, whereupontheloom brake will promptly stop the :loom. A stop 24 holds linki 8 in vthepath of. lever l9 when solenoid l 6 is deenergized. The knock-off mechanismmay :besimilar to e that shown in Payne,Paten,t :No.

The warp threads may be i provided withdrop wires 25 strung along contact-bars one of which is shown at 26 in Fig. 2. Thesebars willordinargi y havev a grounded outer e1ectrode .21 and an inner insulated electrode 28,. Whenever a drop,wi re falls due .to breakageor unduetslackness of awarp thread the--electliodes 21 :and Q28 are; electrically wires and 52 back to the transformer.

3 connected. The warp stop motion may be similar to that shown in Payne Patent No. 1,852,217.

The matter thus iar described except as noted hereinafter is of usual construction and operates in the usual manner. l'he shuttle will ordinarily pass out of the warp shed during forward motion of the lay early enough to prevent breakage or warp threads, but should the shuttle be slow in its night across the loom provision must be made for effecting prompt loom stoppage to prevent a warp smash.

The electric protection includes a timer switch TS which opens at regularly recurring intervals once every pick or beat of the loom, and also a shuttle operated switch SS. The timer switch includes a blade 30, see Fig.2, which is periodically moved by a cam 31 secured to and turning with the top crank shaft 2, see Fig. 1. may actually be operated by a switch arm 32 having direct contact with the cam 31 so that whenever the latter pushes the arm rearwardly, I or to the right in Fig. 1, the switch will open.

Blade 30 will normally engage contact 33 to close switch TS except when moved by tappet 34 of the cam.

The shuttle switch SS has a blade 35 which is normally in open position but is closed by depression of a plunger 36 extending vertically through and slidable in the lay 4 by the shuttle as the latter passes over the plunger. delay mechanism may be associated with the switch SS to hold it closed for a given part of the loom cycle after the plunger 36 is depressed by the shuttle 30. This time delay or holding mechanism may include a hook lever 31 pivoted at 38 on the lay for cooperation with a holding arm 39 associated with the switch SS. A stationary stop 40 is positioned for engagement with the lower end of lever 31, when the lay approaches front center, and lever 31 normally tends to turn in a clockwise direction as viewed in Fig. 1.

In the operation of the electric protection the switch TS will be normally closed so that, referring to Fig. 2, current can flow in the following normally closed protection circuit: transformer T, wire 45, normally closed switch 46 to be described hereinafter, wire 47, solenoid 16, wires 48, 49 and 58, contact 33, blade 30, and

Current-flowing in this circuit will keep the solenoid energized as long as switch TS is closed and link l8 will be held normally above the path of movement of lever 19. Wires 50 and 5|, and

switch TS, may be considered a normally closed branch of the protection circuit.

The time for the opening of timer switch TS by the cam 3! is determined by the time at which shuttle S will normally be able to depress the plunger 36 when it is in proper flight across the lay.- If, for instance, this time is while the lay is at or near back center the timer switch will be set to open at this time to break the aforesaid circuit, but depression of plunger 35 by the shuttle at the proper time will complete an-' other branch of the protection circuit as follows: wire 55, contact 56 of switch SS, switch blade 35, and wire 51 connected to wire 52. This second branch may be considered as normally open. The two branches are in parallel and if v the shuttle is running properly one or the other of the branches will always be closed so that the solenoid l6 will-be normally continuously energized and the knock-off lever will not be able to stop the loom. Should the shuttle be run- The blade.

If desired, a time ning slow, however, switch SS will close late in the loom cycle after the switch TS is open, in which event both branches will be open and the solenoid It will become deenergized to release link [8 and the latter will fall into the path of lever l9 so that the latter will stop the loom as already described. The branches of the protection circuit and switch SS may be similar to part of the electric protection set forth in copending application Serial No. 134,001 filed December 20, 1949, by Moss.

The warp stop motion circuit is normally open, but when a drop wire falls to connect the electrodes 21 and 28" current will flow in the following warp stop 'circuit: transformer T, wires .45 and 6D, the contact bar 26, electro-magnet Bl, wire 62, a shipper handle controlled switch 63, and wire 64. From the latter wire the circuit will be completed through one or the other of the branch circuits back to the transformer to cause energization of the electro-magnet 6i and opening of the switch 46, thereby opening the protection circuit and permitting link 18 to fall into the path of the lever i9. Upon the next working stroke of lever 19 the loom will be stopped even though one or the other of the branch circuits is closed.

If a warp fault should occur when the shuttle fails to close switch SS electro-magnet Bl will not be energized, but the loom will stop due to opening of both branches of the protector circuit. If this stopping should occur while switch TS is still open, and the weaver, after placing the shuttle in the shuttle box, restarts the loom, electro-magnet 6| will be energized as soon as the loom has turned far enough to close switch TS and the loom will be stopped a second time, whereupon the warp fault can be corrected. When the warp stop circuit is closed and switch 63 opens as a result of loom stoppage, electromagnet 6| will become deenergized, but a, signal circuit including wire 60, lamp L, and wire 6| will be completed through bar 26 and one of the branch circuits.

From the foregoing it will be seen that the invention sets forth simple means for utilizing a single solenoid and a single knock-off mechanism for a loom having an electric warp stop motion and electric protection. The protection circuit which maintains the solenoid energized is under control of a switch which is opened when the warp stop circuit is closed, thereby permitting link I8 to fall into the path of lever I!) even though the shuttle is running properly. Link 18 can also be released to fall to stopping position by deenergization of the solenoid I6 by failure of the shuttle to arrive at a given point. along the lay at the correct time in the loom cycle. In either type of stoppage the link 18 will fall into the path of a lever 19 and the latter will be timed so as to bring the loom to rest while the lay is still a suificient distance behind front center so that should the shuttle be trapped in the warp shed there will be no warp smash.

Having thus described the invention it will be seen that changes and modifications of the foregoing specific disclosure may be made without departing from the spirit and scope of the invention.

What is claimed as new is:

1. In stopping means for a loom operating with a shuttle, loom protection electric circuit means normally closed when the shuttle is running properly, a normally energized electr c-magnetic device in said protection circuit means, loom efiective tostdp'the loomfwhen the device is ,deenersizcd. "n rma y .nnsn- Warn stop l c c circuit means closed upon occurrence. 'a warp fault, and normally closed .switchmeans in said protection circuit means controlled 'by the warp I stopbircuit means and opened when the latter f'ci'rcuit means is closed to "open the protection cirj cuit means toefiect deenergiz'ation of said device and thereby enable the stopping mechanism to "'st'op'the loom.

2. In stopping means for a loom operating with a shuttle, stopping mechanism capable of effecting loom stoppage at a given time in the loom cycle, an electro-magnetic device effective if ener-. gized at said given time to prevent the stopping mechanism from stopping the loom, said stopping mechanism being efiective to stop the loom if the device is deenergized at said given time, loom protection electric circuit means controlled by the shuttle causing said device to be energized at said given time if the shuttle is running properly, normally open warp stop electric circuit means closed upon occurrence of a warp fault, and means operative upon closure of the warp stop circuit means to prevent energization of the device by the protection circuit means and thereby enable the stopping mechanism to stop the loom.

3. In stopping means for a loom operating with a shuttle, stopping mechanism capable of effecting loom stoppage, an electro-magnetic-device effective if energized at a given time in the loom cycle to prevent the stopping mechanism from stopping the loom, said stopping mechanism being effective to stop the loom if the device is deenergized at said given time, loom protection electric circuit means controlled by the shuttle causing said device to be energized at said given time if the shuttle is running properly, normally open warp stop electric circuit means closed upon occurrence of a warp fault, and means operative upon closure of the warp stop circuit means to prevent the protection circuit means from energizing the device and thereby enable the stopping mechanism to stop the loom.

4. In stopping means for a loom operating with a shuttle, stopping mechanism operating to stop the loom at a, given time in the loom cycle, an electro-magnetic device controlling the stopping mechanism effective when energized to prevent the mechanism from stopping the loom, said mechanism being efiective to stop the loom when the device is deenergized, loom protection electric circuit means including said device and two branches in parallel one or the other of which will be closed to maintain the device energized so long as the shuttle is running properly, normally open warp stop electric circuit means, a normally closed electric switch in said protection circuit means through which electric current normally flows to one or the other of said branches, and electro-magnetic means effective upon closure of the warp stop circuit means to open said switch and thereby deenergize the device.

5. In stoppin means for a loom operating with a shuttle, stopping mechanism capable of stopping the loom at a given time in the loom cycle, an electro-magnetic device controlling said stopping mechanism, loom protection electric circuit means including a normally closed switch in series with said device and including also two branch circuits one or the other of which will be closed if the shuttle is running properly to maintain said device energized, and normally open warp stop electric circuit means including branchl'ciifouitsfis tioseqys i; Q M ism"' being efietiveto stop" the loom n 'deenerg zation iof'the' device. 4' A 'ri"v stopping fiiea'nsiior alo'omf jopfer ting fwith shuttle,f' stopping lmecnams mapabie 'pfis'topng'j the loom at a givenjtimejinithef l9 fey'cle.

' "delli'.diitrollingfsaid"' "closed switch, said device and two branch circuits in parallel, one of said branch circuits opening periodically and the other branch circuit being closed by the shuttle at said given time if the shuttle is running on time, said device being deenergized if both branch circuits are opened simultaneously, and normally open warp stop electric circuit means including an electromagnet controlling said switch, closure of said warp stop circuit means due to warp failure energizing said electro-magnet with a con-- sequent opening of said switch and said loom protection circuit means to effect deenergization of the device, said warp stop circuit means being completed through one or ;the other of said branch circuits.

7. In stopping means for a loom operating with a shuttle, stopping mechanism including an actuator having a working stroke at a given time in the loom cycle and including also a force transmitting element tending normally to move into thepath of the actuator and efiective to stop the loom when the actuator has said workin stroke provided the element is in said path, loom protection electric circuit means including a normally closedswitch and an electro-magnetic device controlling said element and effective if closed at said given time to energize said device and cause the latter to hold the element out of said path, said protection circuit means being closed at said given time to energize the device provided the shuttle is running on time, and normally open warp stop electric circuit means including an electro-magnet normally deenergized but effective when energized upon closure of said warp stop circuit means to open said switch in the loom protection circuit means to cause deenergization of the device with resultant movement of said element into said path.

8. In stopping means for a loomoperating with a shuttle,stopping mechanism capable of efiecting loom stoppage, an electro-magnetic device efiective if energized at a given time in the loom cycle to prevent the stopping mechanism from stopping the loom, said stopping mechanism being efiective to stop the loom if the device is deenergized at said given time, a single source of electric power, loom protection electric circuit means including said source controlled by the shuttle causing said device to be energized at said given time if the shuttle is running properly, normally open warp stop electric circuit means including said source closed upon occurrence of a warp fault, and means operative upon closure of the warp stop circuit means to prevent the protection circuit means from energizing said device.

9. In stoppin means for a, loom operating with a shuttle, stopping mechanism capable of stopping the loomat a given time in the loom cycle. an electro-magnetic device efiective if energized at said given time to prevent stopping of the loom by said mechanism, the latter being efiective to stop the loom if 'said device is deenergized at said given time, a single source of electric power, loom protection electric circuitfmeans controlled by the shuttle causing said device to be energized at said given time if the shuttle is running properly, normally open warp stop .electric circuit means including said source closed upon occurrence ofa warp fault, and means in operative upon closure of the warp stop circuit means to prevent energization of said device by said protection circuit means and thereby enable the stopping mechanism to stop the loom.

' RAYMOND F. DION.

REFERENCES orrEri The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,054,734 Wintermayr Mar. 4, 1913 1,080,091 Wintermayr Dec. 2, 1913 2,148,700 Lohsse Feb. 28, 1939 2,475,505 Kronoff et al. July 5, 1949 

